Pyrazole monoazo dyestuffs



United States Patent 3,324,105 PYRAZOLE MONOAZO DYESTUFFS Hans-Gerhard Hanke, Leverkusen, Gerhard Wolfrum, v

Opladen, and Hermann Wunderlich, Cologne-Mulheim, Germany, assignors to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany, a corporation of Germany a No Drawing. Filed Nov. 3, 1964, Ser. No. 408,688 Claims priority, application Germany, Nov. 15, 1963,

F 41,287 11 Claims. (Cl. 260-158) The invention relates to novel azo dyestuffs; more particularly it relates to azo dyestuffs which are insoluble or barely soluble in water and which correspond to the formula In this formula A stands for the residue of a diazo component, X stands for a hydroxyl or amino group, n for formula JHaOHzO)nC(Y)m-R It in 4-position, selecting starting components which are free from sulphonic and carboxylic acid groups.

The starting components are preferably coupled in a neutral to weakly acid aqueous, organic or aqueousorganic medium and the dyestuffs obtained, which are barely soluble to insoluble in water, are isolated in the usual way.

Among the diazo components ANH those of the benzene, (benz)thiazole and thiadiazole series are preferred; the diazo components may have non-ionic substituents such as cyano, halogeno, e.g. -Cl and Br, nitro, lower alkyl sulphonyl, e.g. methyl sulphonyl and ethyl sulphonyl, lower alkyl, preferably those having 1 to 4 carbon atoms, lower alkoxy, preferably those having 1 to 3 carbon atoms, carbo lower alkoxy groups the alkyl radicals of which having 1 to 4 carbon atoms, aryl substituents such as phenyl and substituted phenyl (for instance by the above-mentioned substituents), sulphonamide and substituted sulphonamide groups, for instance alkyl or dialkyl substituted sulphonamide groups the alkyl I 7 groups of which having 1 to 5 carbon atoms.

Suitable diazo components are e.g.

3,324,105 Patented June 6, 1967 4-chloro-2-nit-roaniline, 2,6-dichloro-4-nitroaniline, 2,4-dinitro6-chl0ro-aniline, 2-cyano-4-nitroaniline, 2,4-dinitro-6-bromoaniline, 2bromo-4-nitro6-cyario-aniline, 4-methylsulfonylaniline, 2-bromo-4-ethylsulfonylaniline, 2-bromo-4-ethylsulfonyl-6-nitroaniline, 2-methoxy-4-nitroaniline,

4-cyano-aniline,

3,4-dicyano-aniline,

2-cyano-4- or 5-chloroaniline, 4-chloroaniline,

2,4-dichloroaniline,

4-amino-benzoic acid methyl ester, 4-amino-benzoic acid-n-butyl ester, 4-carbethoxy-Z-nitroaniline, 5-amino-3methylthiadiazole-1,2,4, 5-amino-3phenyl-thiadiazole-1,2,4, 5-amino-3benzyl-mercapto-thiadiazole-1,2,4, S-nitro-Z-aminothiazole, 2-amino-6-methyl sulfonylbenzothiazole-1,3 4-amino-azobenzene and Z-amino-anisole.

The azo components to be used according to the invention are obtained by reaction of pyrazoles of the formula wherein X, R and n have the above-mentioned meaning, with organic acid anhydrides, acid chlorides, acid semiester chlorides, isocyanates or chloro-carbonic acid esters. Suitable acylatin-g agents are for example acetic anhydride, propionic acid chloride, succinic acid semiester chloride, benzoyl chloride, 2,4-dichlorobenzoyl chloride, methyl isocyanate, ethyl isocyanate, cyclopentyl isocyanate, cyclohexyl isocyanate, phenyl isocyanate, p-chlorophenyl isocyanate and ethyl chloroformate. From this collection it is apparent that the aliphatic, araliphatic, cycloaliphatic and aromatic radicals R in the coupling components of the Formula II can be further substituted by the usual substituents with the exception of sulphonic and carboxylic acid groups. A special case of the further substitution of aliphatic radicals is given, for example, when ,acid semiester chlorides such as succinic acid semiester chlorides are used for the production of the components (II), leading to the grouping (CH COOR for the radical R; in this, z stands for a whole number, preferably for a whole number from 1 to 4, and R preferably for a lower alkyl radical.

For the production of the new dyestuffs the following compounds are suitable for example:

CH3 X. i;

CH3 K t The new dyestuffs are outlastingly suitable for the dyeing and printing of synthetic fibres, especially of polyolefine fibres, particularly nickel-modified polypropylene, of terephthalic acid polyglycol ester fibres and synthetic superpolyamide fibres as well as cellulose ester fibres (2 /2-and triacetyl cellulose), or fabrics and knitted materials produced therefrom. Since the dyestuffs are insoluble or only slightly soluble in water, the dyeing is expediently carried out in the presence of dispersing compounds. For accelerating the dyeing, swelling agents can be added to the dyebath in the usual way; dyeing may also be carried out at elevated temperatures in closed apparatus.

The following examples are given for the purpose of illustrating the invention, the par-ts being parts by Weight.

Example 1 5.4 parts of 2-chloro-4-nitroaniline are stirred with 20 parts of concentrated hydrochloric acid at room temperature for 4 hours and, after the addition of 30 parts of ice water, diazotized with 20 parts of a 10% sodium nitrite solution at 0 to 5 C. The diazouium salt solution is then poured into a solution of 5.6 parts of the pyrazolone of the formula a i It i.

- I=N CH L 1 E S H O N O The production of the azo components proceeds by molar reaction of l-fl-hydroxyethyl-Il-methyl pyrazolone- (5) with acetic anhydride in acetic acid or water at 50 to C.

25 parts of the yellow dyestuff obtained according to this example are ground with 75 parts of a condensation product from fl-na hthalene sulphonic acid and formaldehyde and with parts of water for 24 hours in a ball mill. The paste is then dried in vacuum at 50 C. and the residue finely ground.

1 part of this dyestulf powder is stirred into 1000 parts of hot water which contains 8-10 parts of a carrier, e.g. benzoic acid, and is adjusted with sulphuric acid to a pH of about 4.5. A very fine dyestuff dispersion is obtained into which 50 parts of polyester fibres are introduced at 40 to 60 C. The dyebath is heated to the boil within 20 minutes and kept at this temperature for one to one and a half hours. The dyed material is then thoroughly rinsed with water and dried. A yellow dyeing is obtained with very good fastness to Wetting, sublimation and light.

The dyeings on polyesters show the same very good fastness properties if the process is carried out with a dispersion in water without carrier additive in a closed dyeing apparatus at temperatures between 105 and C.

Example 2 If the azo component in Example 1 is replaced by the equivalent amount of a pyrazolone of the formula the following dyestuif is obtained which dyes polyester fibres yellow with good fastness properties.

The azo components can be produced by reacting equimolar amounts of 1-fl-hydroxyethyl-3-methyl pyrazolone- (5) with phenyl isocyanate in acentonitrile at 50 to 60 C. in the presence of catalytic amounts of pyridine.

Further valuable dyestuffs are obtained if the diazo and coupling components given in the following table are combined with each other in the stated manner; the dyestuffs obtained dye aromatic polyester fibres in the given shades.

12K. Diazo component Azo component Shade on Polyester 3 2-nitroaniline l Yellow.

HO N I ll CHr-CHz-O-C CH3 4.-. 4-nitroaniline Same as Ex. 3 Do. 5 2,6-dichloro-4-nitroa e -do Do. 6 4-amino-azobenzene Do. 7. 2-cyano-5-chloro- Do. 8 2-cyano-4-nitroaniline Do. 9 4-carbethoxy-2-nitroauiline. D0. 10 5-amino-3-phenylth1adiazo1e-1,2,4 Do. 11 2-amino-benzothiazo1e D0. 12- l-amino-benzoic acid-n-butyl ester Do. 13 2,4-dichloro-aniline Do.

14- 2-nitroaniline Do.

I II CHZCHzO CNHO0H 4-nitroaniline Same as EX. 14 Do. 2,6-dichloro-4-nitroaniline d0 Do. kamino-azobenzene D0. 2-oyano'-5-chloro-anillne Do 2-eyano-4-nitroaniline D0. 4 carbethoxy-2mitroanillne Do. fi amino-B-phenylthiadiazole-l,2,4 Do. 2-amino-benzothiazole. Do. 4-amino-benzoic acid-n-butyl ester- Do. 2,4-dichloro-aniline Do.

If the azo component use-d in Example 1 is replaced by the equivalent amount of a pyrazolone of the formula a valuable dyestufi is likewise obtained which dyes poly- 40 Example 25 esters yellow with good fastness properties.

The azo component used in this case is obtained by reaction of 1-fl-hydroxyethyl-3-methyl-S-amino pyrazole with acetic anhydride in acetic acid.

In an analogous manner the dyestuii of the formula is obtained.

The azo component is produced by the reaction of 1-5- hydroxyethyl-3-methyl pyrazolone-(S) with ethyl chloroformate in acetonitrile in the presence of pyridine.

By the same process the following dyestutf is obtained diazabicyclooctane as catalyst.

Further valuable dyestuffs are obtained if the diazo and coupling components listed in the following table given shades.

are combined with each other in the stated manner; the dyestuffs obtained dye aromatic polyester fibres in the Ex. Diazo component .Azo component Shade on Polyester N 0.

26...- Yellow.

4-nitroaniline Same as Ex. 26

2-cyano-5-ehloro-anilinp 2-cyano-4-nitroaniline 4carbethoxy-2-nitroaniline- 5-arnino-3-phenyl-thiadiazole-1,2,4.

Z-amino-benzothiavnla 4 amino-benzoic aoid-n-butyl ester 2,4-dich1oro-aniline- Z-nitroanilinetC a i L D0. Greenish yellow. Yellow. Greenish yellow.

Yellow. I Do.

Do. Greenish yellow.

I13x. Diazo component Azo component Shade 011 Polyester 4-nitroaniline Same as Ex. 37 Yellow. 2,6-diehlorol-nitroanllin do Greenish yellow. 4-aminoazobenzene -(lo Reddish yellow.

Z-cyano-fi-chloraniline do Greenlsh yellow.

2-cyano-4-nitroaniliue Yellow. 4-carbethoxy-2-nitroaniline Do. 5amino-3-phenyl-thiadiazole-l,2,4 D0. 2-amino-benzo Do. 4-amino-benzoie acid-n-butyl ester. D

2,4-diehloroanlline o. Greenish yellow.

2-nitroaniline |'|C H Yellow.

C I-Iz-C Hz-O- -NHO H:

4-nitroaniline Same as Ex. 48 Do. 2,6-dichlor-4-nitroaniline (lo Greenish yellow. tamino-azobenzenm do Reddish yellow. 2-oyano-5-ehloroaniline. rl o Greemsh yellow.

2-eyano-4-nitroaniline .do Yellow.

4-carbetlioxy-2-nitroanlline -do Do. -amiuo-3-pheuybthiadiazole-LZ,4 do Do. 2-an1iuo-benzothiazole. do Do.

4-amino-benzoio acid-n-butyl ester 2,4-dicliloro-anlline.

Do. Greenlsh yellow.

Example 59 10.8 parts of Z-amino-anisole are dissolved in 60 parts of water and 17 parts of concentrated hydrochloric acid and diazotised at 0 C. With a solution of 6.9 parts of sodium nitrite in 20 parts of water. The diazonium salt solution is then poured into a solution of 24.6 parts of the pyrazolone of the formula i orn-crn-o-oQ in 200 parts of water and 30 parts of sodium hydroxide. When the coupling is terminated, the precipitated dyestufi of the following constitution is filtered off with suction. It yields yellow dyeings with good fastness properties on metal-modified polypropylene fibres.

The azo component is produced by molar reaction of l-fl-hydroxyethyl-3-methyl pyrazolone-(S) with benzoyl chloride in pyridine or dilute alkali.

Example 60 I ll CHrCI-Iz-O C-OCHs in 100 parts of water and 85 parts of a 20% sodium carbonate solution. After 30 minutes the dyestufi' is precipitated by the addition of some common salt. It has the following constitution I ll CH2C Ha-O C-OCHa and dyes aromatic polyesters yellow shades with good general fastness properties.

The azo component is produced by a molar reaction of 1-fl-hydroxyethyl-3-methy1-pyrazolone-(5) with methyl chloroformate in the presence of pyridine.

Example 61 If the azo component of Example 60 is replaced by the equivalent amount of a pyrazolone of the formula U\ICHa l y N=N [CH3 I ll CHr-CHr-OCCH2CHz-C O O CH:

OaN-

is obtained which dyes materials from polyesters yellow shades with excellent fastness properties.

The azo component is produced by reaction of l-flhydroxyethyl-3-methyl-pyrazolone-(5) with succinic acid semi ester chloride.

Example 62 According to the instructions given in Example 61 the following dyestuif is obtainable N=N [CH1 I ll CHz-CHz-OC-NH-GHz-C O O 02H;

OaN

which dyes materials from; polyesters yellow shad very good fastness properties.

es with following table; the d yestulfs thus obtained dye fibres from aromatic .polyesters in shades mentioned below. 7

113x. Diazo Component Azo Component Shade on polyester 0.

-CH a3 Z-njtroanlline l Yellow.

\ N H O CHiCHz-O C-COHs 4-chloro-2-aminobenzoic acid niti'ile. Same as Ex. 63 Do. 5-ultro-2-aminobenzoic acid nitrile Do. 2-chloro-4-nltroaniline Do. 2,4-dinitroaniliue Reddish yellow.

68 -5-nitro-2-aminobenzoic acid nitrile l Yellow.

H o N II CHgCHzO C-CHzCH C 0 0 CH3 5-amino-E-phenylthiadiazole-l,2,4 Same as Ex. 68 Do. 4-ehloro-2-aminobenz oic acid nitrile do Greenlsh yellow. "2-amino-beuzthiazole.. Yellow. 4-amino-benzoie acid methylester Greenish yellow. 4-oarbethoxy-2-nitroaniline. a Yellow. 2,4-dinitroaniline Reddish yellow.

4-chloro-2-aminobenzoic acid nitrile Same as Ex. 75

The azo component used in this example is obtained Greenlsh yellow.

Yellow. Greenish yellow. Yellow.

The following table is a list of diazo components and 1:3 I Diaze Component o p Component ilg ggg l 80 z amino-anlsole.-. T]|C s Reddish yellow. HO

. lHtcHl-ot l-cm s: 2 133531533222}??? fies.

H 83 2-amlnoanlsole s .'l-|CHa Yellow.

A ly o HzCH -O g' NH C5H5 2 3?il iifil fiiiillliil "-"tj::::: ff??? 1::::::::::::::::::::::::::: 8: 86 a-afn'lnoanisole I |CH:I Greenlsh yellow.

. HOLN/N O c n-ncm-oi zocm 87 2-amlnobenzthiazole. Same as Ex. 86 Golden yellow. 88"... 2-amlnoanisole I l l v I II CHzCHz-OCNPL-CHI Greenish yellow.

Ex. Diazo Component Coupling Component Shade on nickel No. polypropylene 89-. Z-aminobenzthiazole- Same as Ex. 88 L Reddish yellow.

90..- Z-aminoanisole OH; Yellow.

N HO CHzCHzO CNHCH;

91 do H-CH3 Greenish yellow.

CH CH1O CCH CI-IzC O O CH;

92.-. -amino-3-phenylthladiazole-1,2,4 Same as Ex. 91 Rcddlsh yellow.

We claim: 5. An azo dyestuff of the formula 1. A20 dyestuffs being free of sulfonic acid and carboxylic acid groups and of the formula:

N=N LICH; AN=N '*HR1 H01 N N t X (JHz-CH:O(R

wherein A stands for a radical selected from the group consisting of nitrothiazolyl; phenylazophenyl; benzothiazolyl; methylsulfonylbenzothiazolyl; thiadiazolyl substituted with a member from the group consisting of methyl, phenyl, nitro, and benzylmercapto; and phenyl substituted with 1-3 members from the group consisting of nitro, chloro, bromo, cyano, methylsulfonyl, ethylsulfonyl, methoxy, and carboalkoxy where the alkoxy has l-4 carbon atoms; X stands for a member selected from the class consisting of OH and NH R stands for a member selected from the class consisting of methyl, phenyl and carboethoxy; n stands for an integer ranging from 1-2; m stands for an integer ranging from 0-1; and R stands for a member selected from the class consisting of methyl, ethyl, cyclopentyl, cyclohexyl, phenyl, benzyl, chlorophenyl, dichlorophenyl, and alkylene carboalkoxy where the alkylene and the alkoxy portions each contain 1-2 carbon atoms.

2. A dyestulf of claim 1 wherein A is o-methoxyphenyl.

3. A dyestufi of claim 1 wherein -(O) -R is a member selected from the class consisting of methyl, methoxy and phenyl.

4. An azo dyestutf of the formula JZUCH, 0

wherein R is a member selected from the class consisting of methyl, ethyl, cyclopentyl, cyclohexyl, phenyl, benzyl, chlorophenyl, dichlorophenyl, and alkylene carboalkoxy Where the alkylene and the alkoxy portions each contain 1-2 carbon atoms.

6. The dyestuif of the formula CHa N HO N 0 ll CH -OHrOC-CH:

7. The dyestuff of the formula -N=N I N-CI'IB H 01 N a 0 Cl 9. The dyestuif of the formula OCH;

=N on l l a no \N/ 1 3 10. The dyestuff of the formula CHr-CHe-O COCHa 11. The dyestuif of the formula 14 References Cited UNITED STATES PATENTS 2,634,262 4/1953 Piepenbrink et a1. 260-163 5 FOREIGN PATENTS 224,238 11/1962 Austria. 1,085,277 7/1960 Germany.

CHARLES B. PARKER, Primary Examiner. FLOYD D. HIGEL, Assistant Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,324 ,105 June 6 1967 Hans-Gerhard Hanke et a1.

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 3, lines 6 to 10, for that portion of the formula reading read C H lines 24 to 30, for that portion of the formula reading I N/ read X N same column 3, line 56 for "out lastingly" read outstandingly column 4, line 69, for "acentonitrile" read acetonitrile column 5, line 39, for "-CH at the end of the formula read -CH Signed and sealed this 25th day of June 1968.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. EDWARD J. BRENNER Attesting Officer Commissioner of Patents 

1. AZO DYESTUFFS BEING FREE OF SULFONIC ACID AND CARBOXYLIC ACID GROUPS AND OF THE FORMULA: 